 let obj={
     name:'zs',
     age:18,
     hobby:{
         a:'唱',
         b:'跳',
         c:'rap'
     },
     a:undefined,
     b:null,
     e:{}
 }

 let newObj =structuredClone(obj)
 obj.hobby.a="篮球"
 console.log(newObj);
 